Best Concrete Contractors in Ajax, ON
15 companies listed · 4 in Ajax · 1 open 24/7 · 11 open weekends · 13 rated 4.5+
Data verified October 18, 2026
Lakes Landscapes
My Basement Leaks
R&O Concrete and More
Samterra Concrete
Rock Stone Masonry
Listed for homeowners in and around Ajax, ON, these 15 companies do concrete work. What each says about mixes, finishes and scheduling around the cold season comes from its own website; the ratings and comments on this page are from public reviews.

Area overview: Ajax, ON
4 of the 15 companies we list are based in Ajax; the other 11 serve Ajax from towns including Oshawa (16 km), Pickering (5 km) and Whitby (8 km). The companies on this page are rated from 4.3 to 5.0 across 275 reviews; 13 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (95%), quality (90%) and responsiveness (83%). The topics that come up most in reviews of the companies on this page are "estimates" and "price". 1 is open around the clock; 11 are open on Saturdays and 3 on Sundays. 2 show a licence on their websites. 2 have ten or more years of experience, the longest 30 years. 2 offer emergency call-outs; 9 give free estimates and 2 are family- or locally-owned. We have a website on file for 14 of the companies on this page; 12 publish a contact page and 10 list a public email. We count these figures across the companies on this page; distances are straight-line, and hours and prices change, so confirm the details with the company before you book.
Which companies here quote at no charge?
Free quotes appear in 9 of the 15 listings on this page. A concrete job cannot be priced down the phone. Someone needs to look at the grade, the truck access, the state of the base and whether there is old concrete to break out and haul away first.